Appeal No. 98-2420
Application No. 08/573,854
This is a decision on appeal from the examiner's final
rejection of claims 1 through 5, all the claims pending in the
application.
Appellants' invention is directed to a compressed air
abrasive particle blast system. Of importance to appellants
is the desire to provide a system that operates at a
significantly
lower operating pressure (i.e., an absolute pressure between 2
and 4.5 bar as compared to conventionally available abrasive
particle blast systems which operate at approximately 7 bars),
while also maintaining abrasion effectivness. As noted on
pages 2 and 3 of the specification,
[t]he invention is based on the recongnition
that a considerable reduction in the operational
pressure is indeed possible when the ratio of
the smallest diameters of the HP-air pipe and
the blast pipe is chosen to lie between 0.6 and
0.9. The absolute pressure P then lies between
2 and 4.5 bar. When the diameter of the blast
pipe is chosen to lie at least between 4mm and
20 mm at this ratio, it is found that the speed
of the mixture issuing from the blast pipe
substantially does not change, and also that the
output, i.e. the quantity of abrasive particles
per unit time and per unit surface area to be
treated, shows very little change. The
considerable reduction in the HP-air pressure,
on the other hand, renders the system energy-
2
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